Like said, it's not so much the speed of the arrow, but how the bow is designed and the trade offs you need to make the speed. That being said all bows made now are fast compared to those of 10 years ago and some are pretty forgiving.

Another thing to consider is the amount of energy the newer faster bows put into an arrow, and how the arrow is designed. This effects dynamic spine and can also effect forgiveness. In my opinion the more energy you have the better the arrows you should have so they are closer matched from arrow to arrow.

I personally don't think brace height is that big of deal as long as you are not getting slapped in the arm by the string. I think Axle to Axle and Reflexed risers are a bigger problem.

Or being over bowed. Many draw more weight than they should or fudge their draw length in order to gain speed, which makes your bow much harder to shoot well.

Paul